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meanings of some idioms

hi
i have some other idiomatic expressions that i couldn't find their meanings can you help me to get them:
1-beggars can't be choosers!
2-rater you than me!
3-that's a weight off my chest!
4-its six of one and half a dozen of the other!
5-you can't have your cake and eat it!
6-don't rub it in!
7-serves you right!